Radioantenna device



Sept. 27, 1932. A CLARK 1,879,978

RADIOANTENNA DEVICE Filed Nov. 28, 1930 3 Sheets-Sheet 1 In venior flames A. Clark A Home y Sept. 27", 1932.

J A CLARK RADI OANTENNA DEVI C E Filed Nov. 28. 1950 W \\\\\Q\ W Ja mes /I. C162 7/? 3 Sheets-Sheet 2 In uentor A Ilomey Sept. 27, 1932. J CLARK 1,879,978

Inventor James A. Cla rk A llomey Patented Sept. 27, 1932 UNETEEE JAMES A. CLARK, OF EL PASO, TEXAS RADIOANTENNA DEVICE:

Application filed November 28, 1980. Serial No. 498,809.

My invention relates to radio antenna.

My invention relates particularly to antenna incorporating means for clarifying and increasing the eliiciency of radio reception particularly in th summer time, through eliminating the undesired effects of static and interference arising from neighboring power lines, generators, motors and other electrical machines.

The features of novelty and the various advantages resident in the invention, its nature, and its composition and arrangement and combination of parts will be readily apparent to any one acquainted with the art to which this invention relates upon consulting the following descriptions of the drawings, in which Figure 1 is a front elevational View of my device which is composed of a metallic box or receptacle generally designated which may be of zinc, copper, brass or the like metal.

Figure 2 is a horizontal section through Figure 1 on the line 2-2.

Figure 3 is a vertical transverse sectional view on the line 8-3 of Figure 1.

Figures 1 and 5 are details of the filter device.

Figure 6 is a wiring diagram showing the r electrical connections of my invention.

The numeral 6 designates an insulated frame formed with longitudinal slots 7 near the longitudinal edges thereof, and slit as at 8 for facilitating the winding of the wires for forming the various coil-s. The numeral 9 denotes a winding of one hundred feet of No. 14' flexible stranded copper wire each end of which is electrically connected by soldering to a terminal of a .0005 microfarad fixed condenser. The remaining side of one of the condensers 10, is connected to one end of a coil 11 wrapped upon a portion of the length of the part 12 of the insulator through the slots 7, and composed of seventy-five feet of No. 2 solid insulated copper wire wound in a clockwise direction and having its inner end brought out and twisted into a loop 13. The other side of the loop 13 is wound counter-clockwise upon the remaining portion of the part 12 of the insulator into a coil 14 of twenty five feet of said No. 2 insulated wire. The outer end oft-he coil-1e designated 15 is connected to one terminal of a fixed c011- denser of .OOSmicrofarad capacity, the other terminal of which is connected to a'wire 17 brought thru the casing 5.. The loop 13 has connected thereto one terminal of a condenser '18fof the fixed type of the capacity of .00035 microfarad, the other terminal of which is grounded to the casing at 19.

What is called the filter consists of a glass or vitreous jar 20 of approximately a minimum capacity of one gallon' This jar is filled approximately two-thirds full with a solution of salt andwater, and it has a cover 21 in which isformed a pair of holes 22 one of which receives the wire 17, and the other the wire 23, leading to the radio set., As observed in the drawings the wires 17 and 23 are led into the jar or receptacle 20 to apoint near the bottom thereof.

When the coils have been properly Wound and deposited into the casing 5, the casing is filled completely with sealing matter such as wax, parafline or an equivalent to thoroughly insulate and position the coils therein. It is contended that the best results are obtainable when the metal case is placed in a refrigerator such as a mechanical or other type of automatic refrigerator. In the absence of a refrigerator of this type it may be placed in ice, or in a cool place, or buried in the ground. The device of my invention may be used with or without an outside aerial.

In the drawings the sealing material is de ignated 24. i

The connections of the various coils and condensers is very clearly illustrated in the diagrammatic view of Figure 7.

Experimenthas disclosed that the use of the device of my invention in connection with a radio receiving apparatus greatly enhances the quality of its reception, and increases the range and clarity of reception and eliminates the annoying static and interference caused by the natural weather conditions and the near presence of artificial electrical disturbance to render the device of my invention operative. r I a It is to be definitely understood that I do not desire to limit the application of this invention to the particular modification set out herein to illustrate the principles thereof, and any change or changes may be made in material and structure consistent with the spirit and scope of the invention.

It should be stated that-the device when employed with an outside aerial is to be connected between the lead-in wire and the radio 7 set. The filter is not considered absolutely essential. I V

What is claimed is A radio antenna device of the class described comprising a metallic casing, coil forms of dielectric material disposed one inside of the other and sealed in said casing, coils on the forms, the outside of said coils having a single loop winding, a condenser having one'terminal connected to both ends of the outsidecoil, and an inside coil consisting of a single winding turned for three quarters of its length in one direction and then reversed for the reniaining quarter of its l'ength,'a tap lead taken from the turn of wire separating the reversed windings, and a condenser connected to said tap lead and having its other terminal grounded tothe casing one e'ndof said inside coilbeing connectedto the free terminal of the first mentioned condenser, andfthe other end connected to another condenser carrying at its free terminal a wire led through the casing a filter connected'between said lead wire and the antenna lead wire of a radio receiving set.

In testimony whereof I afliX my signature.

JAMES CLARK. 

